User Guides
07/20/2026
Domestic Merchant Returns API: User Guide

This user guide provides examples of XML transactions to the USPS Merchant Returns web service and guidance for installation.

Announcements
07/19/2026
DELIVERY - Antelope Post Office - Resumes Operations
Announcements
07/17/2026
DELIVERY - Nespelem Post Office, 99155 - Temporarily Closed
Presentations
07/17/2026
PS Form 3500 Application For Periodicals Mailing Privileges

PS Form 3500 presentation for completing and submitting the application to the PCSC.

Announcements
07/17/2026
INFORMATIONAL - Commercial System Release – July 17, 2026
Announcements
07/17/2026
DELIVERY - Antelope Post Office - Temporarily Closed
Release Notes
07/17/2026
PTR2 Release Notes_DD_07_16_26
Error Codes
07/17/2026
Known Issues List 7.17.2026
Applications/ Forms
07/17/2026
NCOALink® Software Developer License Agreement v29 (7/15/2026)

This agreement licenses the development of software interfaces for the NCOALink® product.

Applications/ Forms
07/17/2026
NCOALink® End User License Agreement v30 (7/15/2026)

This agreement licenses the use of the NCOALink® product to an "End User Licensee".